On Wednesday, the popular Square Register point-of-sale application for iOS has been updated bringing the application up to version 4.0.

In Wednesday’s update, the application has been given a fresh new iOS 7-friendly user interface. Square notes that iPhone, iPod touch, and iPad users will notice that the application is now much easier to navigate.

In addition, users now have improved tipping features, the ability to apply discounts, a customized receipt screen, and support for the latest Square card-reading hardware. A number of bug fixes and stability improvements have also been added, making the application snappier and more reliable for users.

Existing users of Square Register will find the update under the Updates tab in the App Store application. Alternatively, you can download the latest version of Square Register for free from this App Store link.

To make full use of the application if you've never used it before, you will want to order one of Square's free credit card readers, which you can sign up for after creating an account for the application. You can use this reader to charge people using their credit card when they just don't have the cash on hand.